Lotus Mark IV was a trials car by Colin Chapman

Colin Chapman

Anthony Colin Bruce Chapman CBE was an influential British designer, inventor, and builder in the automotive industry, and founder of Lotus Cars....

 built on a Austin 7

Austin 7

The Austin 7 was a car produced from 1922 through to 1939 in the United Kingdom by the Austin Motor Company. Nicknamed the "Baby Austin", it was one of the most popular cars ever produced for the British market, and sold well abroad...

 chassis. Chapman’s success at building trials cars brought another previous customer, Mike Lawson, to order a second trials car in 1952 to replace his Lotus Mark II, in which he won the Wrotham Cup. Once again Chapman chose an Austin Seven as the starting point, reinforcing the frame and installing a four-cylinder

Cylinder (engine)

A cylinder is the central working part of a reciprocating engine or pump, the space in which a piston travels. Multiple cylinders are commonly arranged side by side in a bank, or engine block, which is typically cast from aluminum or cast iron before receiving precision machine work...

 1172cc (71.5ci) Ford sidevalve engine. Chapman used all the tricks he had learned in his previous cars, constructing a lightweight aluminum body with a rounded nosecone. He fitted a 3-speed transmission taken from a Ford 8 and the divided front axle as on his previous cars.

Lawson won his class in the very first attempt in this car, following up with others, solidifying Chapman’s reputation as a designer and engineer. The success of this car, and other requests for more cars, led Chapman and Michael Allen to establish Lotus Engineering in a disused stable in Hornsey

Hornsey

Hornsey is a district in London Borough of Haringey in north London in England. Whilst Hornsey was formerly the name of a parish and later a municipal borough of Middlesex, today, the name refers only to the London district. It is an inner-suburban area located north of Charing Cross.-Locale:The ...

.

Ford Sidevalve Motor

Configuration: S4 SV

Displacement: 1172 cc

Bore/Stroke: 63.5mm x 92.456mm (2.5x3.64")

External links

• Motorbase Accessed February 17, 2006.